java 讀取 excel 轉 json

使用java讀取excel表格，而後將excel文件內容寫到json文件中，參考連接：http://blog.csdn.net/readiay/article/details/45540067

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Map;

public class ExcelToJson {

    JSONArray dataArray = new JSONArray();
    ;
    String newFile = null;

    File dataJson = null;

    /**
     * 讀取xlsx文件
     *
     * @param path
     * @throws IOException
     * @throws ParseException
     */
    public void readXlsx(String path) throws IOException, ParseException {
        XSSFWorkbook xssfWorkbook = new XSSFWorkbook(new FileInputStream(path));
        // 循環工做表Sheet
        for (int numSheet = 0; numSheet < xssfWorkbook.getNumberOfSheets(); numSheet++) {
            XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(numSheet);
            String sheetName = xssfSheet.getSheetName();
            if (xssfSheet == null) {
                continue;
            }
            //當前sheet的json文件
            JSONObject sheetJson = new JSONObject();
            //當前sheet的array，做爲sheetJson 的value值
            JSONArray sheetArr = new JSONArray();
            //sheet的第一行，獲取做爲json的key值
            JSONArray key = new JSONArray();
            int xssfLastRowNum = xssfSheet.getLastRowNum();
            System.out.println("當前表單的最後一行: " + xssfLastRowNum);
            // 循環行Row
            for (int rowNum = 0; rowNum <= xssfLastRowNum; rowNum++) {
                XSSFRow xssfRow = xssfSheet.getRow(rowNum);
                if (xssfRow == null) {
                    continue;
                }

                // 循環列Cell，在這裏組合json文件
                int firstCellNum = xssfRow.getFirstCellNum();
                int lastCellNum = xssfRow.getLastCellNum();
                JSONObject rowJson = new JSONObject();
                for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
                    XSSFCell cell = null;
                    try {
                        cell = xssfRow.getCell(cellNum);
                        if (cell == null) {
                            rowJson.put(key.getString(cellNum), "");
                            continue;
                        }
                        if (rowNum == 0)
                            key.add(toString(cell));
                        else {
                            //如果列號超過了key的大小，則跳過
                            if (cellNum >= key.size()) continue;
                            rowJson.put(key.getString(cellNum), toString(cell));
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                if (!rowJson.isEmpty())
                    sheetArr.add(rowJson);
            }
            sheetJson.put(sheetName, shuffleData(sheetArr));
            dataArray.add(sheetJson);
        }
        System.out.println(dataArray);
    }

    public static void main(String[] args) {
        String path = "C:\\Users\\garila\\Downloads\\test.xlsx";
        String newFilePath = path.substring(0, path.lastIndexOf("."));
        System.out.println(newFilePath);
        ExcelToJson excelToJson = new ExcelToJson();
        try {
            excelToJson.readXlsx(path);
            excelToJson.createJson(newFilePath);
            excelToJson.writeToJson();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }

    public String toString(XSSFCell cell) {
        switch (cell.getCellTypeEnum()) {
            case _NONE:
                cell.setCellType(CellType.STRING);
                return "";
            case NUMERIC:
                if (DateUtil.isCellDateFormatted(cell)) {
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
                    return sdf.format(cell.getDateCellValue());
                }
                cell.setCellType(CellType.STRING);
                return cell.getStringCellValue();
            case STRING:
                String val = cell.getStringCellValue();
                if ("無".equalsIgnoreCase(val)) return "";
                return val;
            case FORMULA:
                return cell.getCellFormula();
            case BLANK:
                return "";
            case BOOLEAN:
                return cell.getBooleanCellValue() + "";
            case ERROR:
                return "非法字符";
            default:
                return "未知字符";
        }
    }

    public void createJson(String path) {
        newFile = path + ".json";
        dataJson = new File(newFile);
        if (dataJson.exists()) {
            dataJson.delete();
        } else {
            try {
                dataJson.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void writeToJson() {
        FileWriter fw = null;
        try {
            fw = new FileWriter(newFile);
            fw.write(dataArray.toString());
            fw.close();
        } catch (Exception e) {

        }
    }

    public JSONArray shuffleData(JSONArray sheetArr) {
        JSONArray array = new JSONArray();
        sheetArr.forEach(jsonStr -> {
            JSONObject object = JSONObject.parseObject(jsonStr.toString());
            int count = 0;
            int length = 0;
            for (Map.Entry<String, Object> map : object.entrySet()) {
                String key = map.getKey();
                Object o = map.getValue();
                length++;
                boolean b = StringUtils.isEmpty(o.toString());
                if (b) {
                    count++;
                }
            }
            if (count != length) {
                array.add(object);
            }
        });
        return array;
    }
}

maven依賴：

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.17</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.17</version>
</dependency>

poi-ooxml是讀取xlsx的依賴包